Halvorson unsuccessfully challenged Shuster, chairman of the House Transportation and Infrastructure Committee, in the past two election cycles, including running as a Democrat in the 2016 general election after Shuster narrowly won the GOP primary.

But Halvorson released a new poll this week showing that just 32 percent of “likely Republican primary voters” in Pennsylvania’s 9th District believe that Shuster deserves to be reelected. Fifty-five percent of the 578 people who were surveyed, from Nov. 21 to 22, say it’s time for someone new to fill the seat.

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Halvorson, a real estate investor and retired Coast Guard captain, told The Hill that he is considering running again in 2018, with a final decision expected to be made in January.

The new research from Halvorson comes amid speculation about whether Shuster will stick around in Congress after he reaches his term limit as Transportation chairman at the end of next year. Shuster, who replaced his father in representing the 9th District, has been in Congress since 2001.